Concave multi-level chess board



FIG. 1 is a perspective view of a concave multi-level chess boardaccording to the present invention;

FIG. 2 is a right-side elevation view thereof; and,

FIG. 3 is a left-side elevation view thereof.

The bottom is plain and unornamented.

The ornamental design for a concave multi-level chess board, as shownand described.